Re: VFD drive problems with older 3 phase motor? Working!

Ok, I got it working. I don't know if it's optimal yet, but it runs as
I would expect it to.

After reading the replies to my original post, I scanned every command
in the programming manual. This showed that there was a way to enable
"amps" readout on the display panel. I did that and found that the
draw was too low. So then I tried other parameters.

As it turned out, I had misunderstood the frequency display. By
default, my unit was running at too low a frequency. At this
frequency, nothing was happening. Too low on the frequency/power
curve.

I then enabled the pot on the front panel for manual frequency
changing and that allowed me to dial in whatever speed I wanted
between the low and high frequency limits. After doing so, I was able
to take some cuts, so the torque is good enough to drive the large
6-jaw chuck and cut metal.

My remaining question - Robin suggested that I should rewire the motor
parallel instead of series. I don't quite understand this. If the
motor was meant to be run two-speed originally at 240v, then I would
think that there is a way of driving the windings using the standard
6-wires and getting full speed and power from the motor. This is
typically spec'd as using the 1-2-3 for 3-phase input and 4-5-6
shorted. If I rewire the windings in parallel, I would expect to get
more power and more current draw than the faceplate specifies in the
normal 2-speed configuration. This is fine, but I don't understand why
rewiring might be necessary to get full faceplate power from the
motor.

Thanks for your help.
-Ted